Originally, there were stables to the west side of the Tavern with ample room for 15 horses. The barn was a large structure used for storing harvested crops and fodder for oxen and horses. The original Dunham Barn was built in the 1840s with hand-hewn timbers, cut nails, and simple stone-on-ground foundations. With a few variations, like gable-entry doors, features of the barn were representative of traditional English construction.
The original barn burnt down in 1963, and a replica barn was built to replace it in 2000. Whenever possible, original construction methods were used.
The barn now serves as a rental and education center for nonprofit organizations, corporations, school groups, scouts, and individuals.